Re: allen syncrograph / 37 ford
The idle mixture adjusts properly as normal. I fixed one vac leak when I first got the car, the hose going to the pipe that feeds the vac wipers was cracked. No more leaks from there. Pulls 25 in hg at idle.
The only other possibility of a vacuum "leak" is the normal leak that all of these cars have from the advance brake since the piston does not seal.
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